Is there ever a case when you would use this balancer on an engine with standard rods?
Yes , build it using what parts you have on hand , does the counterweights look like swiss cheese ?
I wouldn't run that engine without having the balance checked , possibly correct with a neutral balancer and sell that one off to someone looking for one, the two small holes aren't really an issue when it's going to be used to balance the engine anyway, easy enough to pound 2 piece of steel into it and tack weld them into place.
